| 摘要 |
A fan device comprising a plurality of vanes (11b), a fan (11) causing air flow (P) by its rotation, and at least one shroud (10; 10a, 10b) which is installed on the upstream side of the fan (11) and introduces the air flow (P) to the suction side of the fan (11), wherein damping means (10b1, 40A, 40C; 40B) which take in the air flow (P) flowing out from the fan (11) so as to damp the radial component (Va) of the air flow (P) by its interference action are installed on the outer peripheral side of the fan (11), whereby an impact noise, a predominant noise source, can be reduced so as to sufficiently reduce noise caused by the rotation of the fan (11). |
